Z-shaped building block



FIG. 1 is a top right side perspective view of a z-shaped building blockshowing my new design;

FIG. 2 is a bottom right side perspective view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top right side perspective view of a second embodiment of az-shaped building block showing my new design;

FIG. 5 is a bottom right side perspective view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top right side perspective view of a third embodiment of az-shaped building block showing my new design;

FIG. 8 is a bottom right side perspective view thereof;

FIG. 9 is a left side elevational view thereof;

FIG. 10 is a top right side perspective view of a fourth embodiment of az-shaped building block showing my new design;

FIG. 11 is a bottom right side perspective view thereof;

FIG. 12 is a left side elevational view thereof;

FIG. 13 is a top right side perspective view of a fifth embodiment of az-shaped building block showing my new design;

FIG. 14 is a bottom right side perspective view thereof; and,

FIG. 15 is a left side elevational view thereof.

The ornamental design for a z-shaped building block, as shown anddescribed.